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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per share (EPS):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
(9,885
)
 
$
12,640

 
$
20,121

 
$
3,692

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
38,248

 
38,114

 
38,181

 
38,329

Dilutive effect of stock-based awards
—

 
244

 
334

 
262

Weighted average common shares outstanding - Diluted
38,248

 
38,358

 
38,515

 
38,591

Earnings (loss) per common share - Basic
$
(0.26
)
 
$
0.33

 
$
0.53

 
$
0.10

Earnings (loss) per common share - Diluted
$
(0.26
)
 
$
0.33

 
$
0.52

 
$
0.10